If you want to debug a crashing mochitest on Android, you need to attach via Studio. Since we can't actually launch the mochitests via Studio, we need a way to say via mach that we intend to attach a debugger. I think we can do this with adb shell am set-debug-app org.mozilla.geckoview.test.

(In reply to James Willcox (:snorp) (jwillcox@mozilla.com) (he/him) from comment #0)

If you want to debug a crashing mochitest on Android, you need to attach via Studio. Since we can't actually launch the mochitests via Studio, we need a way to say via mach that we intend to attach a debugger. I think we can do this with adb shell am set-debug-app org.mozilla.geckoview.test.

This is possible, but you also have MOZ_DEBUG_{CHILD_}WAIT_FOR_JAVA_DEBUGGER at your disposal. That seems more robust.